最新代码

public/sdk/three/jsm/interactive/SelectionHelper.js

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+import { Vector2 } from 'three';
+
+class SelectionHelper {
+
+	constructor( renderer, cssClassName ) {
+
+		this.element = document.createElement( 'div' );
+		this.element.classList.add( cssClassName );
+		this.element.style.pointerEvents = 'none';
+
+		this.renderer = renderer;
+
+		this.startPoint = new Vector2();
+		this.pointTopLeft = new Vector2();
+		this.pointBottomRight = new Vector2();
+
+		this.isDown = false;
+		this.enabled = true;
+
+		this.onPointerDown = function ( event ) {
+
+			if ( this.enabled === false ) return;
+
+			this.isDown = true;
+			this.onSelectStart( event );
+
+		}.bind( this );
+
+		this.onPointerMove = function ( event ) {
+
+			if ( this.enabled === false ) return;
+
+			if ( this.isDown ) {
+
+				this.onSelectMove( event );
+
+			}
+
+		}.bind( this );
+
+		this.onPointerUp = function ( ) {
+
+			if ( this.enabled === false ) return;
+
+			this.isDown = false;
+			this.onSelectOver();
+
+		}.bind( this );
+
+		this.renderer.domElement.addEventListener( 'pointerdown', this.onPointerDown );
+		this.renderer.domElement.addEventListener( 'pointermove', this.onPointerMove );
+		this.renderer.domElement.addEventListener( 'pointerup', this.onPointerUp );
+
+	}
+
+	dispose() {
+
+		this.renderer.domElement.removeEventListener( 'pointerdown', this.onPointerDown );
+		this.renderer.domElement.removeEventListener( 'pointermove', this.onPointerMove );
+		this.renderer.domElement.removeEventListener( 'pointerup', this.onPointerUp );
+
+	}
+
+	onSelectStart( event ) {
+
+		this.element.style.display = 'none';
+
+		this.renderer.domElement.parentElement.appendChild( this.element );
+
+		this.element.style.left = event.clientX + 'px';
+		this.element.style.top = event.clientY + 'px';
+		this.element.style.width = '0px';
+		this.element.style.height = '0px';
+
+		this.startPoint.x = event.clientX;
+		this.startPoint.y = event.clientY;
+
+	}
+
+	onSelectMove( event ) {
+
+		this.element.style.display = 'block';
+
+		this.pointBottomRight.x = Math.max( this.startPoint.x, event.clientX );
+		this.pointBottomRight.y = Math.max( this.startPoint.y, event.clientY );
+		this.pointTopLeft.x = Math.min( this.startPoint.x, event.clientX );
+		this.pointTopLeft.y = Math.min( this.startPoint.y, event.clientY );
+
+		this.element.style.left = this.pointTopLeft.x + 'px';
+		this.element.style.top = this.pointTopLeft.y + 'px';
+		this.element.style.width = ( this.pointBottomRight.x - this.pointTopLeft.x ) + 'px';
+		this.element.style.height = ( this.pointBottomRight.y - this.pointTopLeft.y ) + 'px';
+
+	}
+
+	onSelectOver() {
+
+		this.element.parentElement.removeChild( this.element );
+
+	}
+
+}
+
+export { SelectionHelper };